本論文提出一種新型葉片式氣動馬達的理論分析與設計方法，改善馬達的轉速漣漪。氣動馬達具有機構簡單與高比功率等優點，並使用壓縮空氣驅動馬達，因此可應用在具有高揮發性氣體的化學工廠中，避免產生火花，防止爆炸，同時氣動馬達內部壓力大於外部壓力，因此可在惡劣髒污的環境中使用。氣動馬達與其他旋轉機械一樣，它們都存在著輸出扭矩振盪的問題，造成這個現象的主要原因，是由於一個週期內各個葉片的輸出扭矩不能互相配合，導致總輸出扭矩產生振盪。為了解決這個問題，我們提出一個新型的定子輪廓設計方法，改善馬達的輸出扭矩，使馬達具有穩定的輸出，新型定子採用非對稱進排氣口與非圓形輪廓，並透過最佳化方法設計單雙向馬達，最佳化的新型馬達在扭矩漣漪上有顯著的改善，也可藉由設定一個較高且合理的膨脹比，使氣動馬達具有較高的輸出扭矩與機械效率，並使用一次一因子方法(one-factor-at-a-time)，討論製造誤差與裝配誤差對扭矩漣漪的影響。為了驗證新型馬達的可行性，藉由線切割、放電加工與研磨等方法製造定子，進行實作與實驗。最後，期望本論文設計的新型定子輪廓可以應用在任何尺寸的葉片式氣動馬達上，使氣動馬達具有更穩定的輸出。

This paper presents the analysis and design of a novel air vane motor. Air motors produce very high specific power. They require compressed air rather than electricity; thus avoid sparks and can be used in demanding environments. Same as other types of rotary machines, air vane motors exhibit torque fluctuations. The varying torque curve is a result of unmatched torques generated by the vanes in one revolution. Torque fluctuations produce dynamic speed ripples that further introduce undesirable vibration. Rather than using auxiliary flywheels to smoothen the fluctuation, we propose a new stator configuration that can help produce a nearly constant output torque. The stator adopts asymmetric inlet/outlet positions and a noncircular inner profile. Through numerical optimizations of the noncircular profile, the torque fluctuation and speed ripples are greatly reduced, when compared with traditional air vane motors with circular stator profiles. Meanwhile, the air vane motors can be more efficient by setting a reasonably higher expansion ratio. The influences of different parameters on torque fluctuation are also compared by sensitivity analysis. To validate the present designs, two novel air motors are illustrated to show the speed ripples can be successfully reduced. Finally, this thesis expects that the optimized noncircular stator profile can be applied to air vane motors of various sizes to eliminate rotating vibrations.

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